Knock Sensor

KNOCK SENSOR










OPERATION
The knock sensor generates a voltage proportional to the magnitude of cylinder block vibration due to knocking and inputs it to the engine control module. Based on this signal, the engine control module provides retard control of the ignition timing.

TROUBLESHOOTING HINTS
When knocking occurs while driving under high-load conditions, the following problems are suspected in addition to the knock sensor itself.
1. Inappropriate ignition plug heat range
2. Inappropriate gasoline
3. Incorrectly adjusted reference ignition timing

HARNESS INSPECTION




Check for an open-circuit or a short-circuit to ground, between the engine control module and knock sensor.
- Knock sensor connector: Disconnected
- Engine control module connector: Disconnected
OK: GO TO STEP 2
NG: Repair the harness. (A1 - 91)




Check for continuity of the ground circuit.
- Connector: Disconnected
OK: STOP
NG: Repair the harness. (A2 Ground)